Setts



(No Model.)

G. CROMPTON & H. WYMAN.

M. G. CROMPTON, Administratrix of G. CROMPTON, deed. FRICTION CLUTCH.

No. 363,507. Patented May 24, 1887.

K. we

M3595 mam-s fl g Georj om vfqw.

, 2o levers to force their shanks apart and cause 40 line 3 y of Fig. 1.

UNITED STATES PATENT OFFICE.

GEORGE OROMPTON AND HORACE WYMAN, OF WORCESTER, MASSACHU- SETTS; SAIDWYMAN ASSIGNOR TO SAID GEORGE OROMPTON; MARY O. OROMPTON ADMINISTRATRIXOF SAID GEORGE CROMPTON, DECEASED.

CLUTCH.

SPECIFICATION forming part of Letters Patent No. 363,507, dated May 24,1887.

Application filed May 28, 1886.

To all whom it may concern.-

Be it known that we, GEORGE ORoMrToN and HORACE WYMAN, of Worcester,county of Worcester, and State of Massachusetts, have 5 invented anIinprovementin FrictioirOlutches,

of which the following description, in connection with the accompanyingdrawings, is a specification, like letters on the drawings representinglike parts.

[O This invention, relating to frict-ion-clutches, consists,essentially, of a shaft provided with a loose pulley having an innerannular flange and a sleeve capable oflongitudinal movement on saidshaft, and provided with a pivoted l 5 wedge, combined with astrap-carrier having a strap nearly encircling said flange, and a pairof levers pivoted to the strap-carrier and having their jaws engagingthe ends of the strap, whereby the wedge may be thrust between the thestrap to bind or clamp the flange of the pulley and secure rotation ofthe pulley with the shaft, the pivoting of the wedge enabling thepressure applied to the strap through the levers to be applied equallyto both levers.

The sleeve carrying the wedge is provided with a flange having a recessto receive the pivoted end of the wedge, the flange preventing thecatching of the clothing of the operator whenattendingamachineas,forinstance, a loom provided with a clutch such asherein described.

The loose pulley is made in two parts, to thereby enable the flange orpart which is em- 3 5 braced by the strap to be turned at little cost.Figure 1 shows in elevation, partly broken away, a clutch embodying ourinvention; Fig. 2, a central vertical section thereof on line x :r, Fig.1; and Fig. 3, a longitudinal section on The shaft Ahas a sleeve, a,provided with a collar, a, which is secured to the said shaft by aset-screw, a, the sleeve affording a bearing for the loose pulley B,while the collar a pre- 4 5 vents longitudinal play of the pulley onsaid sleeve in one direction. The pulley has an annular flange, I),located between its hub b and band-rim b the said hub 1) preferably andin the present instance being shown as cast with Serial No. 203,512 (Nomodel.)

the pulley proper, while the bandrirn b en- ,0 circles it. so as toleave an annular space between the same, the band-rim being attached tothe Vertical wall or portion of said pulley at one side thereof by thebolts 1), as clearly shown in Fig. 2.

A strap-carrier, G, has a hub, c, which encircles and is positivelysecured by the key 0 to the shaft A next that end of the hub 12 of thepulley opposite to that contiguous to the collar a, to preventlongitudinal play of said pulley on the sleeve a, and at the same timecause said strap-carrier O to rotate with the shaft A.

The strap-carrier C is arranged, preferably, within the pulley B,between its flange b and 6: the shaft A, and is provided at one end withan arm or extension, 0 secured by a bolt or bolts, 0 to afriction-strap, D, which nearly encircles the flange I), and is providedat its nearly meeting ends with studs or lateral projections d. (SeeFig. 1.) These studs orprojections d are engaged by the jaws e of twoclamping-levers, E, pivoted, as at e 6 independently of each other tothe strapcarrier G at or near the end opposite tothat having the arm orextension 0 the longer arms orshanks of said levers being eachpreferably provided with an adj usting-screw, e, and holding-nut e.

As clearly indicated in Fig. l, the screws 6 pass through the shanks ofthe levers, so that the rounded inner ends, 0 of said screws are locatedadjacent to and opposite each other, to admit a wedge, f, to beprojected between and to strike said ends to force them apart, andthereby move the levers E on their pivots. When thelevers are thusactuated, the jaws a move toward each other, and in turn press or forcethe studs (1 on the ends of the frictionstrap D in the same direction,whereupon the said strap will be caused to bind or clamp the 0 annularflange b of the pulley B, and thus put the said pulley in clutch withthe carrier, to rotate in unison with the shaft. The wedge is pivoted bythe pin f to the shifting sleeve F, loose on the shaft A, the saidsleeve having q: an annular groove, f, to receive one end of N theshifter g, in usual manner.

The screw 6" in the shanks of the levers E may be adjusted therein tocompensate for wear, and then be held or retained in adj nsted positionby the nuts 6*.

We have shown a coiled spring, h, attached to the shanks of the leversE, to draw said shanks toward each other and facilitate vthe slackeningof the strap D on the flange b when the wedge is sufficiently withdrawnfrom between the adjusting-screws c to permit such slackening of parts.

The levers E are each provided with an offset or shoulder, a, at theends nearest the adjusting-screws 6 which offset projects into the spacebehind the depending plate 0 secured by screws (2 to the extension 0 thepurpose of such construction being to prevent lateral play of thelevers, because of the thrust or withdrawal of the wedge with relationto said levers. V

In order to insure the proper amount of frietion between the strap andthe flange 1), and also to compensate for wear between the said parts,the screws 6 have to be'adjusted in the levers E, and to do thisuniformly, so as to insure like pressure by the entire surface of thestrap, would require very considerable care were the wedge rigidly fixedto the sleeve 13; but to enable the pressure of the clamp to be uniformthroughout, notwithstanding unequal protrusion of the screws 6, thewedge has been pivoted.

Making the part b separate from the part B enables the outer portion orperiphery of the rim 1) to be more conveniently turned true in a lathe.v

The sleeve F has a flange, 12, which forms an effectual guard to preventanything being caught by the wedge in the rotation of the hub.

We claim- 1. A shaft provided with a loose pulley having an innerannular flange, and a sleeve capable oflongitudinal movement on saidshaft,and provided with apivoted wedge, combined with a strap-carriersecured to the shaft and having a strap nearly encircling said flange,and a pair of levers pivoted to said carrier and having jaws engagingthe ends of the strap, as and for the purpose set forth.

2. A shaft provided with a loose pulley having an inner annular flange,and a sleeve capable of longitudinal movement on said shaft and providedwith a pivoted wedge, combined with a strapcarrier secured to the shaftand having a strap nearly encircling said flange,and a pair of leverspivoted independently of each other to the carrier, and having jaws atone end to engage the ends of the strap and oppositelyarranged adjusting-screws at the other end, as and for the purpose specified.

3. A strap-carrier having an extension at one end to permit theattachment thereto of a strap, as specified, the said extension beingprovided with a depending plate, c combined with a pair of leverspivoted to said carrier, and each having an offset or shoulderprojecting between the plate and carrier, as and for the purposespecified.

4. In a friction clutch,a shaft, the pulley B, loose thereon, providedwith a flange, b, and a separate baud-rim, b attached thereto, asdescribed, combined with a strapcarrier secured to the said shaft, and astrap nearly encircling the said flange b, and secured to the saidstrap-carrier, a pair oflevers, E E, and a wedge to actuate the same,all substantially as described.

5. The strap-carrier, the levers E E, and the strap D, having aprojection, d, combined with the wedgef, and the longitudinal sleeve F,having the flange 12, to operate substantially as described.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

GEO. CROMPTON. HORACE W YMAN.

